Production of Oxide Dispersion Strengthened Mg-Zn-Y Alloy by Equal Channel Angular Pressing of Mechanically Alloyed Powder

Keng-Liang Ou; Chia-Chun Chen; Chun Chiu

doi:10.3390/met10050679

Metals (May 2020)

Production of Oxide Dispersion Strengthened Mg-Zn-Y Alloy by Equal Channel Angular Pressing of Mechanically Alloyed Powder

Keng-Liang Ou,
Chia-Chun Chen,
Chun Chiu

Affiliations

Keng-Liang Ou: Department of Dentistry, Taipei Medical University Hospital, Taipei 110, Taiwan
Chia-Chun Chen: Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan
Chun Chiu: Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan

DOI: https://doi.org/10.3390/met10050679
Journal volume & issue: Vol. 10, no. 5
p. 679

Abstract

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Mg-Zn-Y alloys with long-period stacking ordered structures (LPSO) have attracted attention due to their excellent mechanical properties. In addition to the LPSO structure, Mg alloys can also be strengthened by oxide particles. In the present study, oxide dispersion strengthened Mg97Zn1Y2 (at%) alloys were prepared by equal channel angular pressing (ECAP) of mechanical alloyed (MA) powder under an oxygen gas atmosphere. The 20-h-MA powder had a particle size of 28 μm and a crystallite size of 36 nm. During the MA process followed by ECAP, an Mg matrix with dispersed Y2O3 (and MgO) particles was formed. The alloy processed by ECAP exhibited a hardness of 110 HV and a compressive strength of 185 MPa. Compared to pure Mg, the increased hardness was due to the dispersion strengthening of Y2O3 and MgO particles and solution strengthening of Zn and Y.

Published in Metals

ISSN: 2075-4701 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Mining engineering. Metallurgy
Website: http://www.mdpi.com/journal/metals

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